Okui
I think Biginch has a point.
If you are able to find the pumping curves for the pump you are using you may find that you have insufficient head at the supply to keep up with the pumping delivery I.E. the water can't get through to the pump fast enough with the valve open beyond half way...
Gattwood
This isn't really something that you can afford to get wrong, the cost of boiler damage is too high. Not to mention the risks of pitting and gouging causing catastrophic failure.
Consult a treatment specialist or three! these guys will often do a survey for free as they will want to...
Adiallo
The siemens website gives a very in depth run down on their products including step7 but its a bit of over kill
I am getting to grips with siemens myself and I find that going through the help pages in the simatic manager software and reading online forums like this is a good way to get...
